Abstract:
Ein Strahlführungssystem (4) dient zur fokussierenden Führung von Strahlung (3) einer Hochleistungs-Laserlichtquelle (2) hin zu einem Target (5). Das Strahlführungssystem (4) hat mindestens einen Spiegel (7) als reflektive Strahlführungskomponente und mindestens eine für die Strahlung (3) zumindest partiell durchlässige Transmissions-Komponente (9) als refraktive Strahlführungskomponente. Die Anordnung des mindestens einen Spiegels (7) und der mindestens einen Transmissions-Komponente (9) ist derart, dass sich strahlinduzierte Änderungen an den Strahlführungseigenschaften des mindestens einen Spiegels (7) durch strahlinduzierte Änderungen an den Strahlführungseigenschaften der mindestens einen Transmissions-Komponente (9) zumindest teilweise kompensieren. Es resultiert ein Strahlführungssystem, bei dem sich strahlinduzierte Änderungen an den Strahlführungseigenschaften des Strahlführungssystems nicht störend auf die fokussierende Führung der Strahlung der Laserlichtquelle auswirken.
Abstract:
The invention relates to the field of laser physics and laser technology and can be used in the development and production of laser-based plasma chemical systems. The method for obtaining an optical discharge in a gas comprises the optical breakdown of a gas to produce an absorbing plasma region and the maintaining of said region in the beam of a laser throughout the active period thereof. The method is novel in that the breakdown of a gas to produce a plasma region and the maintaining of said region is carried out in a laser resonator. The method is also novel in that the breakdown of a gas to produce a plasma region and the maintaining of said region is carried out in an additional resonator of a three-mirror laser resonator. The method is also novel in that the breakdown of a gas to produce a plasma region and the maintaining of said region is carried out in the focal region of a focused conical laser beam. The method is also novel in that the breakdown of a gas to produce a plasma region and the maintaining of said region is carried out in the focal region of a three-dimensional laser beam. The device for obtaining an optical discharge in a gas comprises a laser which is optically coupled to a focusing lens. The device is novel in that it additionally comprises a laser which is optically coupled to a focusing lens and a system for generating a circular beam in the form of a reflective axicon and a conical mirror, as well as a conical swivel mirror, wherein the angle of convergence of the conical beam is equal to 180°. The device is also novel in that it additionally comprises a laser in the form of a set of disk or diode laser segments situated on the surface of a sphere with a centre at the point at which the optical axes of said laser segments intersect.
Abstract:
A window assembly for a pressurized laser discharge chamber is disclosed and may include a housing that is formed with a recess. The assembly may also include an optic having a first side that is exposed to chamber pressure and an opposed second side, and a compliant member that may be positioned in the recess to space the second side of the optic from the housing under normal chamber operating pressures. For the assembly, the compliant member may be compressible to allow the optic to mechanically abut the assembly housing during a chamber overpressure.
Abstract:
A laser chamber is provided that increases power, initiation, and discharge efficiency over single chamber lasers by providing a multi-fold laser chamber, protrusions, discharge segmentation and inversion techniques.
Abstract:
The invention provides a greater than or equal to 4 khz repetition rate argon fluoride excimer laser system for providing a uv 193 nm wavelength output. The greater than or equal to 4 khz repetition rate argon fluoride excimer laser system includes an argon fluoride excimer laser chamber (22) for producing a 193 nm discharge at a pulse repetition rate greater than or equal to 4 khz. The greater than or equal to 4 khz repetition rate argon fluoride excimer laser chamber (22) includes magnesium fluoride crystal optic windows (20) for outputting the 193 nm output (24) with the magnesium fluoride crystal optic windows (20) having a 255 nm induced absorption less than .08 Abs/42mm when exposed to 5 million pulses pfd 193 nm light at a fluence greater than or equal to 40 mj/cm/pulse and a 42 mm crystal 120nm transmission of at least 30%.
Abstract:
A monolithic ceramic waveguide laser body is made by forming and grinding two or more plates of alumina ceramic to produce internal and external features otherwise impossible to fabricate in a single ceramic body. The plates are bonded together by use of glass frit or by self-friting (diffusion bonding) methods to achieve a vacuum tight enclosure. The ceramic surfaces to be bonded have an "as ground" finish. One internal structure created by this method includes a channel of dimensions from 8 to 1.5 mm square or round that confines an RF or DC electrical discharge and comprises a laser resonator cavity. The channel can be ground to form a "V", "U" or "Z" shape folded cavity. Another internal structure is a gas reservoir connected to the resonator cavity. Various other important features are described that can only be created by this method of building a laser. The plates are bonded together in a furnace at temperatures ranging between 450 °C and 1700 °C, depending on the method used.
Abstract:
An optical apparatus e.g. an interferometric displacement determination device; spectroscopic analysis apparatus; polarisation measurement apparatus; or a heterodyne frequency measurement device has a linear HeNe gas laser having an Ne content of an Ne isotope and an Ne isotope in substantially equal proportions, the apparatus in use having optical feedback toward the laser causing, 0.1 % or more of the light output of the laser to be returned toward the laser (1). Use of this type of laser provides good polarisation stability even though excessive backreflection may occur, and hence the laser's frequency can be readily controlled.